36 Talking With Light
by Gordon McComb
Using light to provide feedback for your robot can
be as simple as a single LED, or more complex
using multiple LED colors. In this article,
we’ll discuss simple techniques to communicate
using light with your Arduino-based robot.
The projects are simple to do, with only basic
components and wiring needed.

44 Build the Kronos Flyer
by Michael Simpson
Part 5: Upgrades.
Read about some add-on items that hopefully will
inspire your imagination.

54 The Neato Robot and ROS
by Boris Kudryavtsev
This eighth grader shows us how to hack a vacuum
bot to turn it into a TABLEBot for competition.

58 Robotic Sensors
by John Blankenship and Samuel Mishal

By giving your robot just a rudimentary ability to
identify objects, you can increase its ability to cope
with more complex situations.